Improved screw-cutter



UNIT-ED STATES- PATENT OFFICE.

JAMES YV. LYON, OF BROOKLYN, NEW YORK.

' I MPRovED SCREW-CUTTER.

Specification forming part of Letters Patent No. 15,700, (lated September 9, 1855.

.To all whom it may concern:

Be it known that I, JAMES W. LYON, of Brooklyn, Kings county, and State of New York, have invented certain new and useful Improvements in Machinery for Cutting Screws; and I do hereby declare the following to be a full description of the same.

The nature of my invention consists in the construction of a slide rest having a slide cntter-tool Working thereon,and combining them With a hollow box into the axis of which the end of the wire to be operatedupcn for maklng the screw is inserted and shaped and finished by the cutting-tool; also, in combining with the box for holding and supporting the end of the wire a set of snap-flies, for cutting the screw-threads, and, lastly, in combinlng and arranging the slide cutter-rest and slide cutter-tool with the box for holding the wire, and dies for cutting the threads upon the screw preparatory to their being severed or detached from the stump of the wire; but to describe my invention more particularly I will refer to the accompanying drawings, forininga part of this specification, the same letters of reference, wherever they occur, rcfcrring to like parts.

Figure lis a perspective view of the machine. Fig. 2 is a longitudinal cut section of the same, except the handles and snap-dies. Fig. 3 is a transverse cut section of the hollow axle, wire-holder box, and snap-dies. Fig. L is a detached face view of the snap-dies.

Letter A represents the slide-rest. This is made of metal and has ahandle attached to one end of it. Upon the upper side olthis slide-rest is arranged a slide-cutter, B, by means of set-screws b2 b2 passing vertically through the slide-cutter B,through a slot, and into the slider-est A, so that the cutter may have a reciprocating motion given to it by means of a lever, G, secured by a center pin, D, to a stump,d2,on the lower side of the sliderest, and operated by the handle E, attached to the lever C. To react the cutter slide, a spring,F,attached to the sliderest,acts against a stud,f2, on the cutter-slide and forces it back immediately on letting go the handle E.

Letter G is an adj usting-screw secured to a shoulder upon the side of the cutter-slide. The object of this adj usting-screw is to regulate the diameter of the screw to be cut by means of the set of the screw, so as to come in contact with a stud, g2, on the upper side of the sliderest, and thereby prevent the cutter from any further forward motion.

Letter H is a hollow box attached to the end. of the slide-rest A and having an opening,H2, through it at right angles to the sliderest for the support of the rod of wire to bc operated upon for making the screw. Secured to the top of the box H is a diecutter holder, I, and to its lower side is a guido, J, for holding the lower ends of the dies for cutting the screws.

Letter K represents the dies for cutting the screw-threads, as shown at the point 7a2. These dies are jointed at their upper ends and attached by their center pins, Z2, to the iace of the die-cutter holder I, so as to bring the dies directly on aline with the axis of the orifice or tap of the box II. Between the sides of the die-stocks is interposed an openingspring, L, the object of which is to open the die-stocks after the threads of the screws have been cut to let it fall from the machine.

Letter M is a diestock clamp suspended at its upper end by ear-pieces on the die-cutter holder I to the back side of the die-stocks, so that its claw or clamping end will clasp the lower'ends of the die-stocks to hold it closed while cutting the thread on the screw. To the back of the clamp is a spring, N, secured at its upper end to the head of the clamp, and having its elastic point resting against the middle bar ofthe clamp M for the purpose of holding it rmlyupon the die-stocks.

Letter P is a set screw passing through the middle bar of the clamp M. The Object of this screw is to regulate the length of the screw to be cut-that is, the end of the wire pressing against the end of the set-screw P forces the clamp off from the die-stock, and thereby lets the new-made screwfall as soon as cut ott' by the sliding cutter to make room for the sncJ ceeding screw to be made.

The operation of my machine is that when the wire is inserted in the orifice ofthe box H, so that the end of it rests against the face of the die-stocks, the cutter is projected forward by means of the handle of the lever C te bring it in contact with the wire to reduce it to the hape required for the screw, the diameter of 1t being governed or gaged by means of the gaging-screwacting upon or against the stop to prevent the cutter from further forward motion. When the shape of the screw has been cut, the handle on the lever C is released and thecutter draws back. The shank ofthe screw is then forced into the die, which cuts the thread upon it. During this operation of cutting the threads the end of the screw comes 1n contact with the adjusting-screw in the clamps, and as it is graduated to correspond with the length of thread cut on the screw it gradually pushes the clamp back till the point of finishing the screw,wl1en it slips off the diestocks and allows them to open, so as to avoid damaging the thread, and at the same time allow the new-made screw, as soon as cut off by the cutter in the process of turning the new screw, to fall from the machine, when the operator, with his hand, readjusts the clamps on the die-stocks, as before, for cutting the threads on the new screw to be formed.

Having now described my improved machine for cutting and finishing screws, I will proceed to state what I claim and desire to secure by Letters Patent ofthe United States:`

Slide-rest, slide cutter-too1,wireholder box, and spring clasp-dies or their equivalents, constructed, combined, and operated in the manner described, for the purpose of cutting and finishing screws, substantially as herein before set forth.

JAS. W. LYON.

Witnesses:

Ronin. S. ROWLEY, CHARLES, S. BARRITT. 

